Well can't change everything over night, I think what they should do is find Cena another rivalry instead of the Miz and allow Miz and Morrison to have theirs.
I mean not for Morrison to win, yet but to really establish both guys as house hold names, they are going to need them for next year Wrestlemania, belt or not, Rock or not.
Cena can be put with anyone and still be a house hold name, I would like for R-Truth (Now a heel) to really start some sadistic rivalry with Cena. Cena, is a mega star and does not really needs to be near the title, I mean they can still give the guy Main events and not being for the belt.
What they need now is to really mak everyone else shine because the following years with out the Veteran stars like Taker, HHH, Edge an HBK are going to be challenging for them.